<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>class选择符</title>
<style>
	.boxSize{ width:200px; height:100px; }
	.boxColor{ background:red; }
	.boxBorder{ border:5px black solid; }
</style>
</head>
<body>
<div class="boxSize boxColor boxBorder"></div>
</body>
</html>

